Running Force in Medium to High-Curvature Wellbores: An Experimental Study and Numerical Simulation of Laboratory and Field Cases

2000 ◽  
Vol 123 (2) ◽  
pp. 133-137
Author(s):  
Abdennour C. Seibi
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Plastic Deformation ◽  
Element Model ◽  
Field Conditions ◽  
Radius Of Curvature ◽  
Horizontal Section ◽  
Novel Approach ◽  
Simulated Field ◽  
Elastic And Plastic Deformation

This paper presents a novel approach to measure and estimate running force for various laboratory and field conditions. The experimental and simulation procedures of different rod/pipe sizes running through various laboratory/field conditions are described in detail. Tests were conducted on rods to measure the running force for various laboratory cases obtained from dimensional analysis. The generated experimental results were used to calibrate a typical laboratory finite element model from which calibrated parameters are used to estimate the running force for prescribed field cases. Both the experimental and simulated field results revealed that the running force depends on the radius of curvature, hole clearance, horizontal section, and contact scenario significantly. Stress analysis of pipes running through curved and horizontal sections showed that pipes undergo elastic and plastic deformation, and the nature of deformation depends on the pipe size and radius of curvature.

The Numerical Simulation Analysis of the Straightening Process of the Large H-Shaped Steel

2012 ◽  
Vol 538-541 ◽  
pp. 905-908
Author(s):  
Lin Chen ◽  
Wei Tong ◽  
Hao Li ◽  
Yu Yan Liu
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Plastic Deformation ◽  
Theoretical Basis ◽  
Simulation Analysis ◽  
Element Model ◽  
Solid Model ◽  
Stress And Strain ◽  
Stress Control ◽  
Set Up

A solid model and finite element model of nine-roller constant roller spacing of large H-shaped steel were set up, researching the problems of elastic-plastic deformation in straightening simulation for nine rollers continuous straightening process of large H-shaped steel. Through analyzing the stress and strain relation of large H-shaped steel, and analyzing the residual stress of H-shaped steel in the straightening process, a theoretical basis for the further step analysis the residual stress control after the H-shaped steel straightening was established.

Experimental Study of Tangential Micro Deflection of Interface of Machined Surfaces

1999 ◽  
Vol 123 (2) ◽  
pp. 365-367 ◽  
Author(s):  
Jun Ni ◽  
Zhenqi Zhu
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Elastic Deformation ◽  
Tangential Force ◽  
Experimental Results ◽  
Contact Interface ◽  
Tangential Stiffness ◽  
Tangential Forces ◽  
Elastic And Plastic Deformation ◽  
Machined Surfaces

This paper studies the characteristics of micro tangential deflection of the interface of mating machined surfaces subjected to normal and tangential forces. Experimental results show that contact interface subjected to a tangential force experiences elastic deformation, plastic deformation and micro slip before macro-breakaway occurs. The linearity of tangential stiffness is only valid in the stage of elastic deformation. The nonlinear tangential stiffness of the interface should be considered in the stages of elastic and plastic deformation before micro-breakaway occurs.

Structural Response under Blast Loads - Simplified Numerical Analysis

2015 ◽  
Vol 782 ◽  
pp. 13-26
Author(s):  
Hong Hao ◽  
Jun Li
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Safety Concern ◽  
Structural Response ◽  
Experimental Tests ◽  
Material Model ◽  
Element Model ◽  
Structural Dynamic ◽  
Inelastic Material ◽  
Blast Loadings

Efficiently and accurately predicting structural dynamic response and damage to external blast loading is a big challenge to both structural engineers and researchers. Theoretical investigation on this problem is complex as it involves non-linear inelastic material properties, effect of time varying strain rates, uncertainties of blast load calculations and the time-dependent structural deformations. Experimental investigation can provide valuable data for locating the damage and establishing the damage criteria. The damage curves generated from the extensive experimental study can provide quick assessment of the structural status. However, such blast experiments always involve safety concern and can be beyond the affordability. Besides this, the correlation of the experimental data with predictive method is difficult since it requires a large number of tests to generate damage curves. Compared with the theoretical and experimental study, numerical simulation does not involve any safety concern and is cost-effective. With verified material model and element model, numerical simulation could be powerful supplement to the experimental tests. However, numerical simulation of structural responses under blast and impact loading could be time and resource consuming. Even with modern computer technology and computational mechanics method, detailed modelling and numerical simulation of responses of structures subjected to blast loadings are still often prohibitive. To address this issue, in the present study, an efficient numerical method is proposed to reliably calculate structural response and damage to blast loadings.

The Study on Numerical Simulation of Tailor Welded Blanks on Square Cup Stamping

2011 ◽  
Vol 189-193 ◽  
pp. 3932-3935
Author(s):  
Xiao Gang Qiu
Keyword(s):  
Numerical Simulation ◽  
Plastic Deformation ◽  
Strain Distribution ◽  
Weld Seam ◽  
Element Model ◽  
Forming Process ◽  
Tailor Welded Blanks ◽  
Tailor Welded Blank ◽  
Different Thickness ◽  
The Finite Element Model

The stamping process of the tailor welded blank(TWB) was simulated by the software of DYNAFORM. The finite element model of a boxy part was founded, and the forming of different thickness and properties of the material was studied. Meanwhile, the influence of weld seam on forming result was analyzed. The results show that the weld seam model which founded by real properties can describe the plastic deformation and strain distribution more exactly in the forming process.

scholarly journals Plastic Response of Thin-Walled Tubes to Detonation

2010 ◽  
Author(s):  
J. Karnesky ◽  
J. Damazo ◽  
J. E. Shepherd ◽  
A. Rusinek
Keyword(s):  
Plastic Deformation ◽  
Element Model ◽  
Flexural Wave ◽  
Radial Deformation ◽  
Experimental Measurements ◽  
Tube Cross Section ◽  
Wave Interference ◽  
Thin Walled ◽  
Elastic And Plastic Deformation ◽  
Deformation Modes

Elastic and plastic deformation of tubes to internal detonations and the shock waves produced by their reflection were investigated. The study included experimental measurements as well as computational modeling. Tests with stoichiometric ethylene-oxygen mixtures were performed at various initial pressures and strain was measured on thin-walled mild-steel tubes. The range of initial pressures covered the span from entirely elastic to fully plastic deformation modes. A model for the pressure load on the tube wall was developed and tested against experimental measurements. This model was applied as a boundary condition in both a single degree of freedom model of the tube cross section and a finite element model of the entire tube. Comparison of computational and experimental results showed reasonable agreement if both strain-rate and strain-hardening effects were accounted for. A unique mode of periodic radial deformation was discovered and explained through modeling as the result of flexural wave interference effects.

scholarly journals Numerical simulation on coal loading process of shearer drum based on discrete element method

2021 ◽  
pp. 014459872110135
Author(s):  
Zhen Tian ◽  
Shuangxi Jing ◽  
Lijuan Zhao ◽  
Wei Liu ◽  
Shan Gao
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Loading Rate ◽  
Low Cost ◽  
Element Model ◽  
Discrete Element ◽  
Helix Angle ◽  
Loading Process ◽  
Coal Particles ◽  
Element Method

The drum is the working mechanism of the coal shearer, and the coal loading performance of the drum is very important for the efficient and safe production of coal mine. In order to study the coal loading performance of the shearer drum, a discrete element model of coupling the drum and coal wall was established by combining the results of the coal property determination and the discrete element method. The movement of coal particles and the mass distribution in different areas were obtained, and the coal particle velocity and coal loading rate were analyzed under the conditions of different helix angles, rotation speeds, traction speeds and cutting depths. The results show that with the increase of helix angle, the coal loading first increases and then decreases; with the increase of cutting depth and traction speed, the coal loading rate decreases; the increase of rotation speed can improve the coal loading performance of drum to a certain extent. The research results show that the discrete element numerical simulation can accurately reflect the coal loading process of the shearer drum, which provides a more convenient, fast and low-cost method for the structural design of shearer drum and the improvement of coal loading performance.

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